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Financial Instruments and Fair Value Measures - Financial Instruments (Details) £ in Millions, SFr in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 EUR (€) company	Dec. 31, 2020 USD ($) company	May 31, 2020 EUR (€)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2019 CHF (SFr)	Sep. 30, 2019 USD ($)
Derivative instruments, notional amount and fair value
Number of outstanding derivative instruments containing credit risk contingent features \| company				0	0
Aggregate principal amount of senior Euro notes \| €						€ 700,000,000
Amount excluded from the assessment of effectiveness for cash flow hedges	$ 0	$ 0
Amount excluded from the assessment of effectiveness for fair value hedges	0	0
Fair value - Derivatives in asset position					$ 189,000,000			$ 53,000,000
Fair value - Derivatives in liability position					166,000,000			132,000,000
Designated as hedging instrument \| Net investment hedges \| Senior notes
Derivative instruments, notional amount and fair value
Aggregate principal amount of senior Euro notes \| €				€ 6,600,000,000			€ 3,600,000,000
Designated as hedging instrument \| Foreign currency forward exchange contracts
Derivative instruments, notional amount and fair value
Treasury rate lock gain recognized in other comprehensive income (loss)	$ (71,000,000)	(5,000,000)	$ 175,000,000
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Cash flow hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments					1,500,000,000			1,000,000,000.0
Duration of forward exchange contracts	18 months
Approximate length of time over which accumulated gains and losses will be recognized in cost of products sold	6 months
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Cash flow hedges \| Prepaid expenses and other
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position					2,000,000			3,000,000
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Cash flow hedges \| Accounts payable and accrued liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position					82,000,000			14,000,000
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Cash flow hedges \| Other assets
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position					0			0
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Cash flow hedges \| Other long-term liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position					6,000,000			0
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Net investment hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments				€ 971,000,000			€ 971,000,000		£ 204	SFr 62
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Net investment hedges \| Prepaid expenses and other
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position					0			0
Designated as hedging instrument \| Foreign currency forward exchange contracts \| Net investment hedges \| Accounts payable and accrued liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position					11,000,000			24,000,000
Designated as hedging instrument \| Treasury rate lock agreements
Derivative instruments, notional amount and fair value
Treasury rate lock gain recognized in other comprehensive income (loss)	$ 0	383,000,000	0
Designated as hedging instrument \| Treasury rate lock agreements \| Cash flow hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments											$ 10,000,000,000.0
Designated as hedging instrument \| Interest rate swap contracts
Derivative instruments, notional amount and fair value
Treasury rate lock gain recognized in other comprehensive income (loss)	$ (53,000,000)	$ 4,000,000	$ 0
Designated as hedging instrument \| Interest rate swap contracts \| Cash flow hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments					2,300,000,000			2,300,000,000
Designated as hedging instrument \| Interest rate swap contracts \| Cash flow hedges \| Prepaid expenses and other
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position					0			0
Designated as hedging instrument \| Interest rate swap contracts \| Cash flow hedges \| Accounts payable and accrued liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position					14,000,000			0
Designated as hedging instrument \| Interest rate swap contracts \| Cash flow hedges \| Other assets
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position					0			3,000,000
Designated as hedging instrument \| Interest rate swap contracts \| Cash flow hedges \| Other long-term liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position					20,000,000			0
Designated as hedging instrument \| Interest rate swap contracts \| Fair value hedges
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments					4,800,000,000			10,800,000,000
Designated as hedging instrument \| Interest rate swap contracts \| Fair value hedges \| Prepaid expenses and other
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position					7,000,000			0
Designated as hedging instrument \| Interest rate swap contracts \| Fair value hedges \| Accounts payable and accrued liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position					0			2,000,000
Designated as hedging instrument \| Interest rate swap contracts \| Fair value hedges \| Other assets
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position					131,000,000			28,000,000
Designated as hedging instrument \| Interest rate swap contracts \| Fair value hedges \| Other long-term liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position					0			74,000,000
Not designated as hedging instrument \| Foreign currency forward exchange contracts
Derivative instruments, notional amount and fair value
Notional amount of derivative instruments					8,600,000,000			7,100,000,000
Not designated as hedging instrument \| Foreign currency forward exchange contracts \| Prepaid expenses and other
Derivative instruments, notional amount and fair value
Fair value - Derivatives in asset position					49,000,000			19,000,000
Not designated as hedging instrument \| Foreign currency forward exchange contracts \| Accounts payable and accrued liabilities
Derivative instruments, notional amount and fair value
Fair value - Derivatives in liability position					$ 33,000,000			$ 18,000,000